1. Calculate a 95% interval estimate for the difference in winnings. What is the margin of error? A. 9.63B.16C. None of the other answers D.8 2. What is the result for the 95% interval estimate? (Note that with rounding you may be off by a few decimals, just choose the closest one) a. $10.88 to $31.12 b. None of the above. c. $11.09 to $20.91 d. $6.38 to $25.62

The information below is to be used for questions 2 through 9. It's difficult to develop a winning strategy when playing "No Limit Texas Hold'em" (a type of poker game). Players will often develop a strategy and test it over thousands of hands. Suppose we have a professional player who is switching up her game to a new strategy. In order to see if her new strategy works she plays poker for 60 days using her old strategy, and then for 60 days using her new strategy, collecting all the data on winnings. The sample size and profit information is summarize below, where strategy is designated by "new" or "old". Sample 1 (new) Sample 2 (old) n = 60 n, = 60 x, = $ 315 x = $ 299 Becuase she's been playing for so long, she knows the population standard deviations: o, = $ 22 (new), and o, = $ 31 (old). Calculate the point estimate for the difference in winnings from her new strategy compared to her old one